Exo 9:8 And the LORD said unto Moses and unto Aaron, Take to you handfuls of ashes of the furnace, and let Moses sprinkle it toward the heaven in the sight of Pharaoh.
Exo 9:9 And it shall become small dust in all the land of Egypt, and shall be a boil breaking forth with Blaine upon man, and upon beast, throughout all the land of Egypt.
Exo 9:10 And they took ashes of the furnace, and stood before Pharaoh; and Moses sprinkled it up toward heaven; and it became a boil breaking forth with Blaine upon man, and upon beast.
Exo 9:11 And the magicians could not stand before Moses because of the boils; for the boil was upon the magicians, and upon all the Egyptians.
The sixth plague was boils and blain upon man and beast. Boils and blaine are best described as large painful oozing pustules. Imagine them over your body and face and soles of your feet. You cannot even walk.
When the Jewish people did not meet the tally of bricks after they had to glean straw to make the bricks, their taskmasters/foreman over themwould be punished first, by haven the soles of their feet paddled while hanged up side down. Then the slaves where beaten. Turning to the Egyptian gods would prove to be in vain. Where were isis, goddess of medicine and peace, hotep, a human turned into an god for his discoveries in medicine, bat, a goddess of life giving milk? The goddess bat is also the calf that Aaron built out of gold and which was destroyed when Moses returned from talking with G-d.
Picture from here